Veneer recovery from second-growth Douglas-fir /

Abstract

Veneer was produced from 768 blocks cut from secondgrowth Douglas-fir from the Coast Ranges in northwestern Oregon. Timber was selected from a variety of stand ages and conditions. The recovery ratio was higher and the veneer grade lower for blocks peeled into 1/6-inch than for 1/10-inch veneer. Densely grown stands had a much higher veneer grade recovery than open grown stands, with no loss in recovery ratios. Block and log data are given in Scribner scale and gross cubic volume.

Conversion of board foot scaled logs to cubic meters in Washington State, 1970–1998

“…The logs utilized, however, were identified by whether they were "old growth" or "young growth," defined as older or younger than 100 years. Forest Service lumber-yield studies (Parry 1989, Fahey and Martin 1974, Lane and others 1973, Plank and Snellgrove 1973 on such logs relate CRR values to log size. To proceed, I selected a combination of diameters for old and young growth (Table 1) whose corresponding CRR factors, weighted by the 1970 shares of old and young growth, approximated the CRR value of the late 1960s study (0.474 and 0.445 for coastal and interior Washington, respectively).…”

“…These reports represent the most consistent and comprehensive statistics on aggregate wood utilization by sawmills in Washington. Additional results from log yield studies conducted by the USDA Forest Service for the coast (Fahey andMartin 1974, Lane andothers 1973) and for the interior (Parry 1989, Plank andSnellgrove 1973) were used to convert some descriptive industry census data into estimates of ratios of finished lumber to raw logs.…”

Veneer recovery of Douglas-fir from the Coast and Cascade Ranges of Oregon and Washington.

“…The last comprehensive veneer recovery reports on coast Douglas-fir were published in 1973 and included data from recovery studies conducted in the 1960s (Fahey 1974, Lane and others 1973, Woodfin 1974. Since the previous studies were run, product standards, mill equipment, and the size and quality of the resource have changed.…”

PLYMAP : a computer simulation model of the rotary peeled softwood plywood manufacturing process

“…Veneer recovery was estimated by grade. Grade recovery equations were based on data of second growth Douglas-fir utilization in mills located on both sides of the Cascades (Cahill 1982;Fahey 1974). Since the target core diameter in these studies was 5.3 in., the equations contain adjustments for specified target cores below that level such that additional veneer recovery is tallied as C or D grade.…”